This Sunday (June 27) Paul McCartney takes to the stage to headline Hard Rock Calling in Hyde Park and YouTube will be hosting a stream from the event at the BornHIVFree channel.

Starting at 8.30pm in the UK (12.30pm Pacific Time), visitors to the channel can enjoy an exclusive broadcast of McCartney's performance, donated by the former Beatle to The Global Fund’s Born HIV Free campaign, which has another high-profile patron in the form of France’s First Lady, Carla Bruni-Sarkozy.

Born HIV Free is urging people pledge their support to The Global Fund’s efforts to eliminate mother to child transmission of HIV by 2015 by adding their names to the organization’s Support Wall. At present, 45% of HIV-Positive pregnant women have access to the drugs they need to block transfer of the virus to their babies, with Global Fund-supported programmes reaching 790,000 to date… 340,000 in 2009 alone. The goal is clear and your voice could make the difference.

So, as you are listening to Paul McCartney work his way through what – with The Beatles, Wings and his solo recordings – must rank as one of the best sets of songs of all time, spare a minute to find out more about Born HIV Free, The Global Fund and maybe even add your support. YouTube will be updating live on Twitter this Sunday via @youtube, and you can add your comments to a planned Twitter stream on the channel using #bornhivfree.